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Biological Assets and Inventory - Sensitivity Analysis of Impact on Fair Value of Biological Assets (Detail) - Sensitivity Analysis [Member] | 12 Months Ended
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Dec. 31, 2018 wk $ / g g g / ml Mass | Dec. 31, 2017 wk $ / g g g / ml
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets [Line Items] |  |
Net selling price per gram | 5.58 | 8.50
Harvest yield per plant | g | 137 | 182
Stage of growth | wk | 6 | 7
Processing costs per gram | 1.98 | 0.82
Selling costs per gram | 0.43 | 0.97
Equivalency factor | g / ml | 0.3 | 0.3
Bottom of Range [member] |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets [Line Items] |  |
Mass multipliers | Mass | 30 |
Top of Range [member] |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets [Line Items] |  |
Mass multipliers | Mass | 50 |

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- Details
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